1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/**********************************************************************
*
* PostGIS - Spatial Types for PostgreSQL
* http://postgis.net
*
* PostGIS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* PostGIS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with PostGIS. If not, see <http://www.gnu.org/licenses/>.
*
**********************************************************************
*
* Copyright 2021 Björn Harrtell
*
**********************************************************************/
#include "geometrywriter.h"
using namespace FlatGeobuf;
using namespace flatbuffers;
const GeometryType GeometryWriter::get_geometrytype(const LWGEOM *lwgeom)
{
int type = lwgeom->type;
switch (type)
{
case POINTTYPE:
return GeometryType::Point;
case LINETYPE:
return GeometryType::LineString;
case TRIANGLETYPE:
return GeometryType::Triangle;
case POLYGONTYPE:
return GeometryType::Polygon;
case MULTIPOINTTYPE:
return GeometryType::MultiPoint;
case MULTILINETYPE:
return GeometryType::MultiLineString;
case MULTIPOLYGONTYPE:
return GeometryType::MultiPolygon;
case TINTYPE:
case COLLECTIONTYPE:
return GeometryType::GeometryCollection;
default:
lwerror("flatgeobuf: get_geometrytype: '%s' geometry type not supported",
lwtype_name(type));
return GeometryType::Unknown;
}
}
void GeometryWriter::writePoint(const LWPOINT *p)
{
writePA(p->point);
}
void GeometryWriter::writeMultiPoint(const LWMPOINT *mp)
{
writePA(lwline_from_lwmpoint(0, mp)->points);
}
void GeometryWriter::writeLineString(const LWLINE *l)
{
writePA(l->points);
}
void GeometryWriter::writeMultiLineString(const LWMLINE *ml)
{
uint32_t ngeoms = ml->ngeoms;
if (ngeoms == 1)
return writePA(ml->geoms[0]->points);
POINTARRAY **ppa = (POINTARRAY **) lwalloc(sizeof(POINTARRAY *) * ngeoms);
for (uint32_t i = 0; i < ngeoms; i++)
ppa[i] = ml->geoms[i]->points;
writePPA(ppa, ngeoms);
}
void GeometryWriter::writePolygon(const LWPOLY *p)
{
writePPA(p->rings, p->nrings);
}
const Offset<Geometry> GeometryWriter::writeMultiPolygon(const LWMPOLY *mp, int depth)
{
std::vector<Offset<Geometry>> parts;
for (uint32_t i = 0; i < mp->ngeoms; i++)
{
auto part = mp->geoms[i];
if (part->nrings != 0)
{
GeometryWriter writer { m_fbb, (LWGEOM *) part, GeometryType::Polygon, m_has_z, m_has_m };
parts.push_back(writer.write(depth + 1));
}
}
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, m_geometry_type, &parts);
}
const Offset<Geometry> GeometryWriter::writeGeometryCollection(const LWCOLLECTION *gc, int depth)
{
std::vector<Offset<Geometry>> parts;
for (uint32_t i = 0; i < gc->ngeoms; i++)
{
auto part = gc->geoms[i];
auto geometry_type = get_geometrytype(part);
GeometryWriter writer { m_fbb, part, geometry_type, m_has_z, m_has_m };
parts.push_back(writer.write(depth + 1));
}
return CreateGeometryDirect(m_fbb, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, m_geometry_type, &parts);
}
void GeometryWriter::writePA(POINTARRAY *pa)
{
POINT4D pt;
for (uint32_t i = 0; i < pa->npoints; i++) {
getPoint4d_p(pa, i, &pt);
m_xy.push_back(pt.x);
m_xy.push_back(pt.y);
if (m_has_z)
m_z.push_back(pt.z);
if (m_has_m)
m_m.push_back(pt.m);
}
}
void GeometryWriter::writePPA(POINTARRAY **ppa, uint32_t len)
{
if (len == 0)
return;
POINTARRAY *pa = ppa[0];
writePA(pa);
if (len > 1) {
uint32_t e = pa->npoints;
m_ends.push_back(e);
for (uint32_t i = 1; i < len; i++) {
pa = ppa[i];
writePA(pa);
m_ends.push_back(e += pa->npoints);
}
}
}
const Offset<Geometry> GeometryWriter::write(int depth)
{
bool unknownGeometryType = false;
if (depth == 0 && m_geometry_type == GeometryType::Unknown) {
m_geometry_type = get_geometrytype(m_lwgeom);
unknownGeometryType = true;
}
switch (m_geometry_type) {
case GeometryType::Point:
writePoint((LWPOINT *) m_lwgeom); break;
case GeometryType::MultiPoint:
writeMultiPoint((LWMPOINT *) m_lwgeom); break;
case GeometryType::LineString:
writeLineString((LWLINE *) m_lwgeom); break;
case GeometryType::MultiLineString:
writeMultiLineString((LWMLINE *) m_lwgeom); break;
case GeometryType::Polygon:
writePolygon((LWPOLY *) m_lwgeom); break;
case GeometryType::MultiPolygon:
return writeMultiPolygon((LWMPOLY *) m_lwgeom, depth);
case GeometryType::GeometryCollection:
return writeGeometryCollection((LWCOLLECTION *) m_lwgeom, depth);
/*case GeometryType::CircularString:
writeSimpleCurve(m_ogrGeometry->toCircularString()); break;
case GeometryType::CompoundCurve:
return writeCompoundCurve(m_ogrGeometry->toCompoundCurve(), depth);
case GeometryType::CurvePolygon:
return writeCurvePolygon(m_ogrGeometry->toCurvePolygon(), depth);
case GeometryType::MultiCurve:
return writeGeometryCollection(m_ogrGeometry->toMultiCurve(), depth);
case GeometryType::MultiSurface:
return writeGeometryCollection(m_ogrGeometry->toMultiSurface(), depth);
case GeometryType::PolyhedralSurface:
return writePolyhedralSurface(m_ogrGeometry->toPolyhedralSurface(), depth);
case GeometryType::Triangle:
writePolygon(m_ogrGeometry->toTriangle()); break;
case GeometryType::TIN:
writeTIN(m_ogrGeometry->toTriangulatedSurface()); break;*/
default:
lwerror("flatgeobuf: GeometryWriter::write: '%s' geometry type not supported",
lwtype_name(m_lwgeom->type));
return 0;
}
const auto pEnds = m_ends.empty() ? nullptr : &m_ends;
const auto pXy = m_xy.empty() ? nullptr : &m_xy;
const auto pZ = m_z.empty() ? nullptr : &m_z;
const auto pM = m_m.empty() ? nullptr : &m_m;
const auto geometryType = depth > 0 || unknownGeometryType ? m_geometry_type : GeometryType::Unknown;
return FlatGeobuf::CreateGeometryDirect(m_fbb, pEnds, pXy, pZ, pM, nullptr, nullptr, geometryType);
}
|
